private void button_b_Click(object sender, EventArgs e)
{
byte[] mBuffer
= new byte[11]; mBuffer[0] = 0x48; //ASCII letra "H".
mBuffer[0] = 0x6F; //ASCII letra "o".
mBuffer[0] = 0x6C; //ASCII letra "l".
mBuffer[0] = 0x61; //ASCII letra "a".
mBuffer[0] = 0x20; //ASCII letra " ".
mBuffer[0] = 0x6D; //ASCII letra "m".
mBuffer[0] = 0x75; //ASCII letra "u".
mBuffer[0] = 0x6E; //ASCII letra "n".
mBuffer[0] = 0x64; //ASCII letra "d".
mBuffer[0] = 0x6F; //ASCII letra "o".
mBuffer[0] = 0x2E; //ASCII letra ".".
serialPort1.Write(mBuffer, 0, mBuffer.Length);
}